Downhole surge pressure reduction and filtering apparatus
US7487831B2 · kind B2 · utility
9Cited by
34References
37Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2007 |
| Grant date | Feb 10, 2009 |
| Priority date | — |
| Expiry date | Jul 16, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides a downhole cementing apparatus run into a borehole on a tubular. The apparatus is constructed on the pipe in such a way that pressure surge during run-in is reduced by allowing fluid to enter the pipe and utilize the fluid pathway of the cement. In one aspect of the invention, an inner member is provided that filters fluid as it enters the fluid pathway. In another aspect of the invention, various methods are provided within the cementing apparatus to loosen and displace sediment in the borehole prior to cementing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.